Resharper. Visual Studio is 95% of the way there but living without that last 5% is like dragging my face across broken glass. I truly hate Microsoft's solutions to some of the features that R# offers.
No I just do ordinary C#, nothing particularly fancy. It accelerates my workby solving a few small use-cases and providing faster solutions for others.
Rider is not bad either, as it's resharper as an IDE.